黏土掺量对粉煤灰动力特性影响

摘要

为研究不同黏土掺量对粉煤灰土动力特性影响,设计不同黏土掺量(10％、20％、30％),对黏土粉煤灰的动强度以及抗剪强度参数等动力特性变化规律开展试验研究,并得到动力特性参数与黏土掺量定量表征关系,研究结果表明:随着黏土掺量的增加,粉煤灰混凝土动强度呈现指数函数变化增大,最大增幅可达23.0 kPa;黏土改良粉煤灰抗剪强度参数,随黏土掺量增加线性提高,粘聚力最大增幅为12.40 kPa,内摩擦角由17°增大至25°,提升约为47.06％.掺加黏土能够实现对粉煤灰土改良,有效增强粉煤灰土动强度及动抗剪强度,对于具体工程实践可通过工程抗液化要求确定最优黏土掺量.%In order to study the influence of different clay content on the dynamic characteristics of fly ash soil,different clay content (10 ％,20％,30 ％) was designed to test the dynamic characteristics of clay fly ash,such as dynamic strength and shear strength parameters.The results show that with the increase of clay content,the dynamic strength of fly ash increases exponentially with the maximum increase of 23.0 kPa.The clay-modified pulverized coal shear strength parameter increases linearly with the increase of clay content.The maximum increase of cohesion is 12.40 kPa,the internal friction angle increases from 17 (y) to 25 (y),and the improvement is about 47.06 ％.Addition of clay can improve the fly ash soil and increase the dynamic strength and shear strength of fly ash soil effectively.For the specific engineering practice,the optimum clay content can be determined through the engineering anti-liquefaction requirements.